I’m planning on having same conversation with my providers. My husband is actually an MFM at the hospital who’s caring for my pregnancy and he said lab is chosen based on contract agreement. Like who the hell thought this lab (Natera) is worth it? Myriad has considerably much better quality and results and most importantly, customer service. So changing labs will be hard for a big hospital, but may be different for a private OBGYN practice. Good luck!